The Adycha (Russian: Адыча; Yakut: Адыаччы, Adıaccı) is a river in the Republic of Sakha in Russia.

[1] At the end of the Soviet period, a big dam with a hydroelectric station was planned to be built on the river, but following perestroika and economic difficulties in the country the project was given up.

It heads first westwards and then roughly northwestwards, flanking the western side of the Nendelgin Range across a wide river valley.

After bending around the northern end of the Tirekhtyakh Range it heads northwards and meanders strongly.

The main tributaries of the Adycha are Delakag (Делакаг), Charky (Чаркы) and Tuostakh (Туостах) on the right; and Derbeke (Дербеке), Nelgese (Нельгесе) and Borulakh (Борулах) on the left.